Transmission for radial drill arms, elevating mechanism, and drill spindles



Sept; 11, 1928.

J. C.'CARLTON TRANSMISSION FOR RADIAL DRILL ARMS, ELEVATING MECHANISM,

- AND DRILL SPINDLES Filed Jan 9, 1926 noentoz 5 Sept. 11, 1928. 1, ,344

J C. CARLTON TRANSMISSION FOR RAD ML DRILL ARMS, ELEVAT'ING HECHANISI;AND DRILL SPINDLES 3 Sheets-Shut 3 Filed Jan. 1926 Patented Sept. 11,1928.

UNITE STATES 1,684,344 PA'PEN'H QFFKEE-i.

JACK C: CARLTON, OFCINGINNATLOHIOgASSIGNDRT"TH'E CARLTGNMGHINETUOBCOMPANY, OF CINGI'N NATL OHIO, 'A CGBPORRTION OFOHIO."

TRANSMISSION. FOR RADIAL; DRILL ARMS, ELEViATING-T MECHANISM; AND DRILLSIEINDLESJ,

Appticationfiled -J'an;ua-ry,'9, 1 926. Serial Nm .80,318.:.

This invention relatesto improvements in.

machine tools, and has formic-object. toprovide a radialdrillingmachinein whioh power means. such as an electric motor, can betrans.- 5 inittahly connected with an organized com mercial machineeither at the base of the column or at the arm, without change-in thetransmission gearing, the removal or replacement of one shaft onlybeingxnecessary ac cording as the power means is mounted upon the-arm orupon thebase.

Another object of the invention is to provide a:transmission unit for aradial drill adapted to be mounted upon .the arm. to form.

airoil reservoir when so mounted, and further ad a pted to establishtran mission connection.

betwecn'the column shaft, andthe-arm raising and spindle operatingmechanisms,- in

such manner that power can be applied'eitlier I through the column withthe power unit mounted uponithe'basc, or directly through the arm shaftwith the power unit mo inted columnshaft and an arm shaft to beconnectedwith respective gears, or to be removed therefrom or rearranged, toconstitute either gear a driver for operatingboth spindle and.

arm raising mechanisms.

Another object is to provide-means of the above nature. whereby a powerunit can be mounted upon the arm, and power attached directly to the armshaft, co-axially thereitnothcrobject is to provide anautomatici'cversiiig device for preventing-mm safety arm fromover-travelling in an upward direction. the device acting to reverse thedirection oi trarel of the arm usit all but reaches its upper limit.

i ty ii 'eiitionis particularly useful ill-COD ncction with a radialdrilling machine wherer in it is dvsired to u e an electric motor as adriwz", and to p mounted eihcr upon the base of the machine or upon thearm,without i'cquiiiiiigchangcs in the column: raising aiid ditilloperating.

transmission gearing.

tached to the back of the arm, to permit a;

nit of the motor to be- Other objects and. certain advantagesiwill; 1 bei more fully set; forth i in the -.deseriptionot; the accompanying;drawings lforniingm part: of this specificatiomdn which Figure 1.is;anielevationof a radialdnillzi showingniy invention mounted upon-thearm,; with the power appliedathroughithe'column. shatt, andwithtl'ie-inotor mounted .on thflr base of the machine.

Figure 2 is a fragmentary viewshowing the power appliedidirectl-ytoitheiarm shaft,;. with. the. motor mounted uponithe-arm.i. I

Figure 8 is asectionthrough:the-arnnthe. parts broken away to show.portions-ofthei arm raising, and. automatic. satiety.armarei. versingmechanism. I

Figure v4 isia. plansectiona online Aer-4,011.. Figure 3, showingoneposition otthe. trip element.

Figurefris a fragmentary .plan showinga... second position of thetrip,element..

Figure 16 is a :detailed vertical, section: on line 616-of.Figure 5,showingithe trip, ele ments engaged.

Figure 7 is a vertical section of the trans missioncasingon.line.7%7 ofFigure 3.,

Figure 8 is awplan section.on,line'8-.810f. Figure .7, more clearlyshowingthe reversing, mechanism. i

Figure 9 is ayvertical sectiononlin'e ,99 of Figure 8, through .thereversing plate.

The-invention is showninFi'gure 1 applied to a type of radial. drillhavingan arnncarry: ing sleeve 1 rotatably inountediiponia tubularcolumn 2, the arm 3 beingelevatedor lowered 1 upon the sleeve and thesleevev r0tate.d;,0r 90 swung about the column, Ac transmission. shaft,not shown, is journalledinand extends vertically interiorly of the.column :and this shaft at its upper endistransmittably connected with avertical .exteriorly, mounted 5 sleeveor column. shaft'4ejournalled inupper. andlower bearings, .5, 6, uponthe sleeve. The lower .end'of theinterior column shaft is. connected through suitable transmissiongearing withzaimotor 10 mounted upon the base ofthe 0 machine, andb vmeans of this motor. the outer or exterior column shaft 4, is rotatedfor operating the arm raising, and drill head and drill? operatingmechanisms, the transmission" gearing in the arm having an organizedunit 5 in which. a. change in driving shattcan be made, from thevertical tohorizontaLiwithout changerini gear arrangement nor need 'itbe dismantled to make the change. The shafts are susceptible to beremoved by a sliding disconnection.

Journalled upon the arm horizontally is an arm shaft 11 which traversesthe head stock 12 and is transmittably connected with the spindleoperating mechanism therein. This arm shaft 11 is transmittablyconnected through transmission gearing journalled in a casing 15 mountedon the rear side of the arm with the vertical shaft l when the transmission is driven from a motor at the base of the column as representedin Figure l, the shaft 4 being eliminated when the transmission gearingin the casing 15 is driven by a motor mounted directly upon the column.The casing 15 is attached at the inner end of the arm and independentlyjournals and encloses the gearing, and journals the pinions and gearsindependent of their shafts.

The motor as shown in Figure l, is transmittably connected with thedrill operating shaft intermediately, through a shock absorbing device17, a structure which forms no part of this invention. The motor shaftcan however be elongated and coupled directly with the stump knee shaft16. he motor connection with the interior column shaft can be made inany well known manner either direct with the motor shaft or intermediatetransmission gearing between the motor shaft and inner column shaft.

Referring particularly to Figures 7 and 8, the transmission casing 15,providing an oil type casing in which the gears are ournalled, is boltedto the rear side of the arm adjacent the column. This transmission unitprovides the drive for the drill spindle and arm elevating mechanisms,the invention herein being primarily directed to the transmission unitmounted on the arm, which can be driven from shafts disposed inrelatively angular planes. The casing has right angularly related pairsof aligned openings 20, 21, therein to permit the free introductionthrough the casing of correspondingly related shafts, one the exteriorcolumn shaft 4 and the other the arm shaft 11. The casing is furtherdivided horizontally by a partition 22.

A vertically disposed sleeve 25, tubular shaft, or hub extension of thebevel gear 26 is 'journalled in upper and lower bearings 28,

29, of the casing, and the hub of this gear or journal, is interiorlylongitudinally grooved as at 30 for sliding or splined connection withthe castellated exterior column shaft. The journal can either be madeseparately, and a bevel gear keyed thereto at its lower end as hereinshown, or the sleeve can form an integral part or hub extension of thegear, and in the latter case I designate this a bevel sleeve gear.

A substantially similarly constructed sleeve 35, having the bevel gear36 keyed thereon at its inner end, is journalled horizontally inbearings 37, 38, in the lower portion of the reservoir casing, and thebeveled gears 26, 36, are meshed and constantly remain so. The exteriorcolumn shaft is splined to the vertical hub extension and extends freelythrough the opening in the opposite wall of the casing axially alignedwith the axis of the hub or sleeve. This opening is preferably closed bya cap 40 having an inwardly upwardly extended protecting sleeve 41, thesaid sleeve having its end disposed within a cavity of the gear orwithin the bore of an annular nut 42 which in this instance secures thegear to the sleeve hub.

This independent mounting of the bevel gears permits the shafts to bedisengaged or withdrawn, always leaving the gears in fixed meshedrelation, and allows the column sha ft to be connected with ordisconnected from the gear 26 so that shaft 43 or its equivalent can beconnected with gear 36 to constitute that gear a driver for spindle andarm opera- [1011.

The arm shaft enters the sleeve 3-5 from the left, and is splined orkeyed thereto but extends only partially therethrough, so that a shaft43 introduced through the axially aligned opening 20 in the right wallof the casing can also be engaged with the bore of the sleeve andtransmittably connected therewith.

After the shaft 49 of the power unit ha been coupled as shown in dot andda h lines in Figure 7. the cap and sleeve 40, 41, are transposed fromopening 21 to opening 20 and positioned as shown in dot and dash lines.

As an example of the utility of the device as a means for alternatelyconnecting power to base or arm without change in the trans missiongearing ol the arm. let it be supposed that the drill is sold with amotor mounted on the base and transmittably connected with the interiorcolumn shaft through the stun'ip knee shaft 16 as shown in Figure 1. Ifat any future time it is desired to mount the motor upon the arm and tosuitably connect the same for operating the arm raising and head anddrill mechanisms, it is only neces ary to attach a bracket 3. to thearm, as shown in Figure 2. remove the exterior column shaft from theupward vertical sleeve extension, and directly direct the power to thelower sleeve through a short castellated shaft which is passed throughthe opening 20 the right side of the casing and non-rotatably en ned inthe bore of said horizontally disposed sleeve as shown in dot and dashlines, Figure 7.

Arm raising, lowering, and renaming transmission mechanism.

The connection between the bevel gear transmission members, for raisingand lowermg, and reversing the dlrections of travel of assess;

the arm, is partly made by means of a spur gear attached to thevertically disposed hub extension or sleeve, and for this purposecertain reversing and transmission gearing is mounted on the arm, butextends into the casing.

Keyed to the hub extension or sleeve 25 is a spur gear 45, as oneelement of a reversing transmission mechanism connecting said hubextension with an arm raising nut 53 rotatably mounted on the arm.

The back of the arm is recessed as at -l6 to provide clearance for thereversing plate 47 and to receive the hearings 48, 49, upper and lower,which project horizontally trom the back of the casing 15. one dependingfrom the top of said casing and one extending upwardly from thehorizontal partition 22. These bearings support the vertical shatt 50 onwhich the reversing plate is pivoted, and this shaft also journals aspur gear 51 which is in constant mesh with a spur gear 52 keyed to thenut Second and third gears 5 1, form part of a reversing transmissiontrain, the three gears being in constant mesh and the latter gears beingboth disengageable from or alternately engageable with the gear of thehub 25, as the plate is swung.

The column cap 56 has attached thereto 21 depending stationary screw 57which freely traverses the arm and has threaded connection with al'tYOlVlIlQ nut 53 journalled vertically as at (30. 61, in the arm (seeFigure The journals are in the form of thrust bearings, and the lowerend of the nut. is shoul- (lei-ed and the spur gear 52 is keyed to thecounter-turncd portion, forming the shoulder. The reversing transmissionconnections be tween this spur of the nut and the spur on the sleeve isbest shown in Figure 8, and th s mechanism comprises the plate 4separately pivotally mounted upon the vertical Fit). The gear isrotatably mounted on this shatt and lies within a groove portion of theplate.

The casing. when bolted to the lo t the arm, is adapted to act as an oilreservoir. and for this purpose has sight openings in its side wallsadjacent the lower portions, (see Figures 3 and 7). These sight openingsare covered and sealed by gh. plates, and the oil lever within the ca fcan be observed. a splash lubrication being obtained by the revolvinglower bevel gear.

An oil reservoir and mounting for various parts ot a transmission andreversing transmissiim gearing is thus provided which may beconveniently attached to or detached from the arm.

To permit and facilitate the removal of the hub extension or sleeve 25and gear attached thereto, without removal of the sleeve from itsbearings, the bearings tor said sleeve are mounted in a removablehousing 70 which is suitably fitted in upper and lower openings 21. 71,ot' the casing 15.

The hub extension sleeve 25 is mounted in this housing 70 in a manner toalso readily permit of the removal of the bearings, sleeve and bevelgear from the housing, and in this construction the back of the bevelgear 26 forms a shoulder which engages against the lower bearing 29.

A sleeve is interposed between the bearing 29 and the gear 45. The gear45 at the upper side is supported against a shoulder formed bycounter-turning the sleeve or hub 25. Adjacent to this shoulder, andextending toward. the upper end of the hub are screw threads 62 whichare engaged in a threaded collar 63, the upper end of which abuts thelower side of the upper bearing 28. At the opposite side of the bearing28 and on a counter-turn portion of the sleeve are formed additionalthreads 64 with which are engaged an annular nut which engages againstthe upper side of the bearing 28. The sleeve or hub extension is thusheld against translative movement, and may be conveniently removed fromthe housing 70 for repairing or replacement. The opening 68 isshouldered to receive the bearing 28 and the cylindrical extension ofcap 62) engages the upper side of the outer ring portion of the bearing28 and suitably held in position by screws.

As above mentioned the bearings 2'8, 29, are supported in a removablehousing 70 which is flanged at its upper end and said housing is heldand secured within openings 21, Tl, respectively at the top of thehousing, and of the horizontal partition 2:2. This housing is hold inposition by screws, and when it is desired to remove the bevel gear andsleeve, the whole housing including the bearings may be drawn upwardlyand outw ardly. The housing is of hollow cylindrical formation and aportion of the cylindrical wall is cut away to permit the terminalmembers of the rcversim plate gear train to engage the spur gear 140 ofthe sleeve 25.

Before the casing can be removed in the above mentioned manner, thepivot pin 50 or journal tor the reversing plate 47 must be removedvertically and the plate disengaged. However, the whole oil reservoircasing can be also remov d by disengaging the bolts, but this operation-an only be performed after the shaft t has been removed.

lfieveraing mechanism control de ve'ce.

The reversing plate may be operated mannally in any preferred manner,but is herein contro lid through a manually and automatically operablearm reversing satety device, comprising a shaft 80 vertically mounted inthe arm (see Figures 3. at, 5, and 6). This shaft is suitably journalledin upper and lowcr bearings of the arm and has near its lower end a handlever 81 extending outwardly through a slot in the frame, or through acover attached to the frame. A. crank arm TE) extends from the shaft 80,and a double linl connection 83 is provided between this arm and theplate, one end of the link being connected as at 84 to the plate. Thuswhen the shaft rotated in opposite directions, the plate iscorrcspondiugly moved to bring either one or the other of the gears 54,55, in mesh with the sleeve gear for obtaining reverse motions of thenut and arm. Suitable adjustable stops limit plate swing.

Automatic trip for reversing weaken-8222.

In order to auton'iatically reverse the direction of travel of the armas it nears its upper limit. a radial cam is provided upon the shaft 80,said cam having an inclined face 83 engagcable by a pin as dependingfrom the cap plate of the column. An opening: 87 is provided in the topof the arms, and the pin is adapted to pass through this opening andengage H e inclined face of the cam. (see Figures 5 and (I). hen the camis in the position shown in Figure 5, the pin 86 will engage the cam andthe shaft will be rotatcd to shift the plate 47 to bring the gear 54 inmesh with the gear 4:"; for obtainng a rcvc or downward movement of thearm. The position of the lever in Figure 4, corresponds to the positionof the plate shown in Figure 8, wherein the gear 5 4, is meshed with thegear 45 for obtaining a downward movement of the arm. When the lever Siis positioned as in Figure 5, the small 55 is engaged with the gear 45and the arm is travelling upwardly.

The relation of the inclined face of the cam to the opening 87 in thetop of the casing is best shown in Figure 6, the control shaft is throwninto counter-clockwise direction. correspondingly swinging the plate andbringing the larger gear 54 into mesh with Having described myinvention. I claim:

1. A radial drilling machine including a column, an arm translatableupon the column. a shaft journalled in the arm and extendinglongitudinally thereof, a transmission casing mounted upon the rc'irside of said arm, meshing bevel gears each having a sleeve hubjournallcd in the casing for iournalling its gear independently of ashaft connecting with the near. one of said gears connecting with saidarm shaft and the. second bevel gear adapted to be connected with adriving shaft, arm elevating transmission mechanism having drivingconnection with the second bevel gear. both of said bevel gears .plinedfor the reception of the power driving shaft, adapting the power shaftto be selectively connected to either of said gears for transmitting thesame, in one position coextensive with the arm shaft and the second atright angles thereto.

2. A radial drill including a column, an arm translatable on the column,a transmission casing upon the arm having two meshed bevel gearsindependently journalled therein adapted for connection respectivelywith a column shaft, and an arm shaft, arm raising mechanism connectedwith one of the gears. said casing having openings in its walls one inaxial alignment with and in opposition to each gear for permitting acorresponding shaft to traverse the casing and be connected with ordisconnected from a corresponding gear, to alternately constitute eithergear a driver.

3. An arm elevator casing for a radial drill, as a transmission unit,attachable to the arm, having meshed bevel gears therein, each gearhaving a hollow hub extension independently rotatably supported withinthe casing, each sleeve adapted for splined connection respectively witha column shaft or arm shaft, said casing having openings through itswalls, one axially aligned and in opposition to each gear for permittinga corresponding shaft to traverse the casing and to be connected witheither gear to constitute th: t gear a driver.

4. An arm elevator for a radial drill incl uding a casing attachable tothe arm, meshing bevel gears independently journalled in the casing,each adapted to transmittably connect with a shaft. said casing havingopenings, one axially aligned with each gear and at the opposite wall ofthe casing for permitting a shaft to traverse the casing and connectwith a gear whereby shaft can be introduced through a correspondingopening and operably connected with a corresponding gear to constitutethat gear a driving memher without disturbing the meshed relation gears.

5. A drill including a column, an arm vertically translatable upon thecolumn, vertical and horizontal meshing bevel gears rotatable upon thearm, an arm shaft keyed to the horizontal gear and extending partiallytherethrough, so that second shaft can be connected with the gear incoaxial relation, bearings on said column one above and one below thevertical gear, axially aligned with the axis of said vertical gear. saidbearings adapted to removahly support an exterior column shaft, whenpassed through the vertical gear, permitting said vcrti cal gear to beconst noted a driving element. and further permitting said horizontalgear to be constituted a driving element when said exterior columnshaftis disconnected, without disturbing the meshed relation of saidbevel gears.

6. In a radial drill, a column, an arm translatable on the column,meshing bevel sleeve gears independently journalled upon the arm anelevating screw on the column, a nut for said screw journaled on thearm, a column shaft splined to the sleeve of one of said gears, an armshaft keyed to the sleeve of the other gear. and reversing transmissiongearing within the casing connecting the nut and one of the sleevegears, said casing having openings opi 'iosingly related to each sleevegear for permitting introduction of a shaft through the casing andcorresponding gear, adapting said sleeve gears to be selectivelyconnected with a power shaft for driving the same.

7. A radial drill including a column, an arm translatable upon thecolumn, meshing bevel gears each having a hell .v hub extensionjournalled upon the arm, an elevating screw for the arm, a nut for saidelevating screw, reversing transmission gearing upon the arm connectingsaid nut with one of said hub extensions. a column shatt passing throughone of the hub extensions and having splined connection therewith. andan arm shaft keyed to the other hub extension and passing partiallvthercthrough. whereby by removal of the column shaft, the shatt ot amotor can be directly connected with that hub extension keyed to the armshaft. thus permitting this extension to function as a driving elementwithout affecting the operation of or requiring changes in said meshingbevel gears or said reversing transmission gearing.

8. A radial drill including a column, an arm translatable upon saidcolumn, sleeves journalled upon the arm at right angles to one another,meshing beveled gears one on each sleeve, said casing having openingsone axially aligned with each sleeve for permitting shafts to traversesleeves and casing. an elevating screw for the arm, a nut tor said screwjournalled in said casing, reversing transn'iission gearing: connectingsaid nut vith one of said sleeves. a column shatt passing through one ofthe sleeves and casing. and having splined connection therewith, and anarm shaft ke ved to the other sleeve and passing partiallytlreretluough. whm'eh either sleeve can be constituted a d riving'element without affecting the operation of or requiring changes in saidreversing transmission gearing.

9. A radial drill including a column, an arm translatable upon thecolumn, meshing bevel gears each having a hollow huh extensionjournalled upon the arm. an elevating screw for the arm. a nut for saidscrew, reversing transmission gearing upon the arm connecting said nutwith one of said sleeves. a column shal't passing through one of thehubs and splined thereto, and an arm shatt keyed to the other sleeve andpassing partially therethrough, whereby shafts can alternately beconnected to either one or the other of the gears so that either gearcan act as a driving element without affecting the operation of orrequiring changes in said meshing bevel gears or said reversingtransmission gearin In Witness whereof, I hereunto subscribe my name.

JACK C. CARLTON.

